Thanks for the resource. Only issue is I'm only seeing 'A-10 Radio' pinouts/diagrams, not 'P17 Info Display Module' pinouts. Only thing I found close was on the 'Driver Information and Entertainment (I03) Diagram that seems to indicate:
Pin 5 connects to Radio A-X1: Linear Interconnect Network Bus 10
Pin 3 is some sort of data that connects to Radio A-X1 - Low Speed GMLAN Serial Data A but also Radio A-X2 pin 1-4 and 7 which are two pairs of MOST data and the MOST control.
Pin 10 is ground.